Hey, thats great news.My gfx-card in my MacPro1,1 is broken and I need a new one.Let's say I buy a new 5770 in a pc-store and the card is compatible with the newest flash from you guys - will I be able to use the gfx-card (see anything on my monitor) during the installation of OSX or does it need a running system with the correct drivers installed?

Hey, thats great news.My gfx-card in my MacPro1,1 is broken and I need a new one.Let's say I buy a new 5770 in a pc-store and the card is compatible with the newest flash from you guys - will I be able to use the gfx-card (see anything on my monitor) during the installation of OSX or does it need a running system with the correct drivers installed?

I have just bought a new gfx-card (XFX 5770 - HD-577A-ZNFA) for my MacPro1,1. After flashing the card with the m57702.ROM, I booted the machine with the SnowLeopard install disc. When I turned on the machine the grey boot-up screen with the Apple-logo (EFI ?) showed up.

It looks like it works! Currently the machine is running the SL-install - will report back when installation is finished.

Edit: It is only working when using a DVI -> VGA adapter. No screen-output when using DVI only.

That's good. So you have EFI boot screen on this one. That works for some 5770s, but not for any 5870 that I know of.

Plus, it shows that you can use the card without drivers. I thought so. Only Nvidia cards cause a panic if they don't find proper drivers (which is a shame BTW). You're lucky, because if you had a card that didn't show video during boot (and most of them don't), it wouldn't have output any video with the install disc that lack proper drivers.